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Seven chapters explore the diverse geology of Virginia, from its Appalachian highlands to the Atlantic shore.
Excerpt from The Potomac Formation in Virginia In his annual reports Professor Rogers regarded the Mesozoic areas Of Virginia as composed Of strata belonging to two different epochs not remote from each other. The Older strata be called Middle Second ary, and the younger Upper Secondary. In his Middle Secondary be included all the areas except the most easterly ones and the northern detached portion of the Richmond coal field. The Upper Secondary areas Of Professor Rogers are those numbered 6 and 7 by Prof. James D. Dana,2 with also the northern portion of no. 5, these being the portions mentioned above as excepted. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
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The authors have synthesized 16 years of geological and geophysical studies which document an 85-km-wide impact crater buried 500 m beneath Chesapeake Bay in south eastern Virginia, USA. In doing so, they have integrated extensive seismic reflection profiling and deep core drilling to analyze the structure, morphology, gravimetrics, sedimentology, petrology, geochemistry, and paleontology of this submarine structure. Of special interest are a detailed comparison with other terrestrial and extraterrestrial craters, as well as a conceptual model and computer simulation of the impact. The extensive illustrations encompass more than 150 line drawings and core photographs.